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Oxidation state of subarc mantle

Citation

Evans, KA and Elburg, MA and Kamenetsky, VS, Oxidation state of subarc mantle, Geology (Boulder), 40, (9) pp. 783-786. ISSN 0091-7613 (2012) [Refereed Article]

Copyright Statement

Copyright 2012 Geological Society of America

DOI: doi:10.1130/G33037.1

Abstract

The subarc mantle is a primary control on the composition of arc magmas and the formation of arc-related ore deposits. Elevated ferric iron contents in arc lavas have been interpreted as a record of subarc mantle that is oxidized relative to mid-oceanic ridge basalt (MORB), but this conclusion is controversial. Measurements of spinel compositions in primitive arc lavas imply an arc magma source 1-4 log units more oxidized than MORB and ocean island basalts analyzed using the same technique. Samples from seven arcs show a significant correlation (P < 0.0005) between redox budget, subduction zone convergence rate, and subduction zone age. These results support the notion of oxidized arc lavas in the mantle source zone, but resolution of contradictory evidence regarding subarc mantle redox state requires further work. © 2012 Geological Society of America.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Geology
Research Field:Igneous and Metamorphic Petrology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:Kamenetsky, VS (Professor Vadim Kamenetsky)
ID Code:81364
Year Published:2012
Funding Support:Australian Research Council (DP1092823)
Web of Science® Times Cited:37
Deposited By:Centre for Ore Deposit Research - CODES CoE
Deposited On:2012-12-03
Last Modified:2017-10-30
Downloads:0

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